Art of metal-working.



G. E. MARKLEY.

ART OF METAL WORKING.

APPLICATION FILED NOV. 14. 1912.

Patented Nov. 16, 1915.

UNITED STATES PATENT OFFICE.

GEORGE E. MARKLEY, OF CLEVELAND, OHIO.

ART or Marat-WORKING.

T all whom it may concern Be it known that I, GEORGE E. MARKLEY, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a new and useful Art of Metal-\Vorking, of which the following is a specification.

In the manufacture of squirrel cage rotors for induction motors, the rotor bars are connected at their ends by end rings which have heretofore been separate ring members attached to the rotor bars by soldering, brazin or welding.

The object of my present invention is to produce a metallic cross connector between metal bars directly from the material of such bars, and especially to produce an end ring directly from the material of the rotor bars, and to provide an improved method by means of which such cross connectors or end rings can be readily produced.

The accompanying drawing illustrates my invention, Figure 1 of said drawing being a perspective view of a squirrel cage rotor in the process of production of my improved article, and Fig. 2 being a partial vertical section through one of the rotor bars in position in the mold.

II\1\ the drawings, 10, indicate the bars of the rotor which are made somewhat longer than has heretofore been customary so that they may initially project to a greater extent from the ends of the main body of the rotor.

11, 11 indicate sections of an annular trough mold which, when assembled, form an annular trough through which the ends of the rotor bars project. These trough sections are made of material having a high fusing point, carbon or platinum being satisfactory for such purpose, and when the trough sections are assembled around the rotor bars the rotor is placed with its axis vertical so that the trough formed by the sections 11 will be horizontal and uppermost. Thereupon the upwardly projecting ends of the rotor bars 10 are subjected to the action of a high temperature flame or electric are 12, which may be produced in any desired manner, so that the upwardly projecting ends of the rotor bars will be melted down into the trough formed by the sections 11 the molten material from the several bars fusing together into a single ring member which will be integral with the bars and thus produce the highest possible efiiciency Specification of Letters Patent.

0t electrical connection. The ring may be glven any desired cross section by proper formation of the trough portion of the segments 11, the bars being given a sufiicient initial length to provide the necessary metal; After the ring has been formed the trough sections can be readily removed for another use.

I claim as my invention:

1. That improvement in the art of producing rotors comprising encompassing the projecting ends of the rotor bars in a trough-like mold, and subsequently melting the projecting ends of the rotor bars into such trough-like mold so as to fuse the material of the bars into a connecting ring integral therewith.

2. That improvement in the art of producing rotors comprising the melting of the ends of the rotor'bars in such manner and to such degree as to cause the molten material to flow and to coalesce without pressure into a ring integral with and connecting the several rotor bars.

3. That improvement in the art of metal working comprising the arrangement of a plurality of separate metal members into a desired group, the subjection of adjacent portions of the several members to a sufficient heat to liquefy said portions sufliciently so they can unite without pressure, and the control of flow of said liquefied portions in such manner as to form an integral bridge piece connecting the several separate mem- 4. That improvement in the art of producing rotors comprising placing the rotor bars vertically, encompassing their. upper ends in a trough-like mold through the bottom of which said bars project, applying suflicient heat to melt the upwardly projecting ends of said rotor bars in said trough-like mold to fuse-the material of such ends into a connecting ring of melted metal, and allowing the melted metal in the trough-like mold to cool to form a connecting ring integral with the rotor bars.

5. That improvement in the art of metal working comprising the encompassing of parts of a plurality of metal members in a trough-like mold through the bottom of which said members project, applyin suflicient heat to melt and cause the flow ng of the parts of such members which project upwardly from the bottom of said mold into a connecting ring of molten metal connecting Patented Nov. 16, 1915, 7 Application filed November 14, 1912. Serial No. 731,311.

said members, and allowing the molten mamy hand and at Cleveland, Ohio, this teri alnin said trough-like mold to cool to 11 day of November, A. D. one thousand form an integral connection between the nine hundred and twelve.

parts of'said members which project down- 1 GEORGE E. MARKLEY [L.s.] 5 ward through the bottom of said trongh-' Witnesses-z like mold. BERNICE W. HELBEIN,

' In witness whereof, I have hereunto set R. B. HAn'rwm, 

